Bobcat 331 Mini Excavator HYDRAULIC Repair & Troubleshooting Schematic (S/N 232511001 – 232512782) 331E (S/N 232711001 – 232711433) 334 (S/N 232611001 – 232612157)

Q1
Q2
T1,T2
PS
BLADE CYLINDER
CENTER SWIVEL JOINT
E
B
D
C
A
H
F
G
P2 P1
HYDRAULIC/HYDROSTATIC SCHEMATIC
331 (S/N 232511001 - 232512782)
331E (S/N 232711001 - 232711433)
334 (S/N 232611001 - 232612157)
(PRINTED AUGUST 2002)
V-0063
RIGHT HAND TRAVEL MOTOR
10
1 of 6
Dealer Copy -- Not for Resale
BOOM SWING CYLINDER
BOOM CYLINDER
ARM
BOOM SWING
RIGHT HAND
TRAVEL
BOOM
LEFT HAND
TRAVEL
b
A
B
A
B
B
A
a
B
A
b
a
A
P1
P2
ARM CYLINDER
EXTENDIBLE
ARM CYLINDER
CONTROL VALVE
12
13
14
18
19
33
23
27
29
2 of 6
Dealer Copy -- Not for Resale
3
4
1
2
T
LEFT HAND JOYSTICK
P
3
4
1
2
T
RIGHT HAND JOYSTICK
P
L3 ISO
L
1
IS
O
R3 I
S
O
US OPTION
ISO/STD CONVERTER
(ISO SHOWN)
L3
L
1
R1 ISO
R
3
R1
BACK
FRONT
STD
I
SO
C
P1
B
A
PSI
V1
G
G1
HYDRAULIC PUMP
A1
S
1
9
21
MANIFOLD ASSEMBLY
20
27
32
3 of 6
Dealer Copy -- Not for Resale
Q1
Q2
T1,T2
PS
P2 P1
WORKING CIRCUITS
PILOT CIRCUITS
DRAIN CIRCUITS
COMPONENTS
Printed in U.S.A.
LEFT HAND TRAVEL MOTOR
11
4 of 6
Dealer Copy -- Not for Resale
BUCKET CYLINDER
OIL
COOLER
TOP
BOTTOM
AUXILIARY
BOOST
SWING
BUCKET
a
T1
A
B
b
a
A
B
b
a
A
B
A
B
b
a
A
B
B
A
b
a
P3
FEMALE (PRESSURE)
CASE DRAIN FILTER
WITH BY
T2
BLADE
DIRECT TO
TANK VALVE
(EXCLUDE FOR
U.S. OPTION)
MALE (RETURN)
X
X
EXTENDIBLE
ARM CYLINDER
331E**D ONLY
SWING MOTOR
24
8
8
5
17
18
16
15
22
27
30
31
5 of 6
Dealer Copy -- Not for Resale
OIL
COOLER
BREATHER CAP
P1
P2
P3
V1
V2
V3
MAIN FILTER WITH BY-PASS
CASE DRAIN FILTER
WITH BY-PASS
T
G
PB
T1
F
V-0063 (8-8-02)
1
25
28
6
7
2
A3
A2
A1
S1
21
4
3
20
26
27
6 of 6
Dealer Copy -- Not for Resale
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